Tiarnan is a boy’s given name and surname of Irish origin. It’s a variant of Tiernan, which is itself an anglicized form of the Irish Tiarnáin. Deriving from the Irish word tiarna, the name means “lord,” making it a fitting choice for the little one who’s sure to rule your household! Famous bearers of this noble Irish name include Irish rugby player Tiernan O’Halloran and Irish comedian and actor Tommy Tiernan.
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